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Referring `a-s` diagram in , find the velocity after particle travel `120 m` from starting. Assume `v_(0)=0`. . |
Answer» `a=-(s)/(20)+200` `underset(0)overset(v)(int)v dv =underset(0)overset(250)(int)(-(s)/(20)+20)ds rArr (v^(2))/(2)=[-(s^(2)/(40)+20)s]_(0)^(250)` `(v^(2))/(2)=-((250)^(2))/(40)+20 xx250` `rArr v^(2)= 6875 rArr v=25 sqrt11 ms^(-1)`. |
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